Photoshop poster gradient

Quick answer：

Photoshop is a graphics editing software used for creating posters and other visual content. A gradient in Photoshop refers to a smooth transition between two or more colors. It is commonly used to add depth and visual interest to designs. To create a gradient in a Photoshop poster, you would use the Gradient Tool and select the desired color stops and type of gradient (linear, radial, angle, reflected, or diamond).